{"product_id":"k3-1-pressure-washer-unloader-valve-3-0-4-2-gpm-400-1450-psi-oem-replacement-part","title":"K3.1 Pressure Washer Unloader Valve 3.0–4.2 GPM 400–1450 PSI – OEM Replacement Part","description":"\u003cp data-start=\"0\" data-end=\"168\"\u003e\u003cstrong data-start=\"0\" data-end=\"16\"\u003ePart Number:\u003c\/strong\u003e 1594\u003cbr data-start=\"21\" data-end=\"24\"\u003e\u003cstrong data-start=\"24\" data-end=\"37\"\u003eCategory:\u003c\/strong\u003e Pressure Washer Parts → Unloader Valves → Flow Actuated Unloader Valves\u003cbr data-start=\"109\" data-end=\"112\"\u003e\u003cstrong data-start=\"112\" data-end=\"121\"\u003eType:\u003c\/strong\u003e General Pump K3.1 Flow Actuated Unloader Valve\u003c\/p\u003e\n\u003chr data-start=\"170\" data-end=\"173\"\u003e\n\u003cp data-start=\"268\" data-end=\"722\"\u003eThe \u003cstrong data-start=\"272\" data-end=\"321\"\u003eGeneral Pump K3.1 Unloader Valve (Part #1594)\u003c\/strong\u003e is a premium \u003cstrong data-start=\"335\" data-end=\"367\"\u003eflow-actuated unloader valve\u003c\/strong\u003e engineered for pressure washer systems operating between \u003cstrong data-start=\"425\" data-end=\"444\"\u003e3.0 and 4.2 GPM\u003c\/strong\u003e and pressures up to \u003cstrong data-start=\"465\" data-end=\"478\"\u003e1,450 PSI\u003c\/strong\u003e. Designed with General Pump's unique \u003cstrong data-start=\"516\" data-end=\"566\"\u003ebalanced nozzle and balanced piston technology\u003c\/strong\u003e, the K3.1 provides precise pressure regulation while eliminating the high-pressure spikes commonly associated with traditional pressure-actuated unloaders.\u003c\/p\u003e\n\u003chr data-start=\"1234\" data-end=\"1237\"\u003e\n\u003ch2 data-section-id=\"939trr\" data-start=\"1239\" data-end=\"1265\"\u003eKey Features \u0026amp; Benefits\u003c\/h2\u003e\n\u003cul data-start=\"1267\" data-end=\"1827\"\u003e\n\u003cli data-section-id=\"1yufexy\" data-start=\"1267\" data-end=\"1320\"\u003eGenuine General Pump OEM replacement unloader valve\u003c\/li\u003e\n\u003cli data-section-id=\"1meom8v\" data-start=\"1321\" data-end=\"1353\"\u003eFlow-actuated bypass operation\u003c\/li\u003e\n\u003cli data-section-id=\"gbb1tm\" data-start=\"1354\" data-end=\"1388\"\u003eDesigned for 3.0–4.2 GPM systems\u003c\/li\u003e\n\u003cli data-section-id=\"6upcgt\" data-start=\"1389\" data-end=\"1432\"\u003eAdjustable pressure range up to 1,450 PSI\u003c\/li\u003e\n\u003cli data-section-id=\"7zc2c7\" data-start=\"1433\" data-end=\"1468\"\u003eUnique balanced nozzle technology\u003c\/li\u003e\n\u003cli data-section-id=\"14yna0d\" data-start=\"1469\" data-end=\"1525\"\u003eBalanced piston design for precise pressure adjustment\u003c\/li\u003e\n\u003cli data-section-id=\"1icxlnp\" data-start=\"1526\" data-end=\"1587\"\u003eEliminates pressure peaks common with traditional unloaders\u003c\/li\u003e\n\u003cli data-section-id=\"9ltirg\" data-start=\"1588\" data-end=\"1649\"\u003eReduces pressure in discharge lines during bypass operation\u003c\/li\u003e\n\u003cli data-section-id=\"1nuwngr\" data-start=\"1650\" data-end=\"1695\"\u003eNo exposed external springs or moving parts\u003c\/li\u003e\n\u003cli data-section-id=\"15vkacr\" data-start=\"1696\" data-end=\"1745\"\u003eBrass and stainless steel internal construction\u003c\/li\u003e\n\u003cli data-section-id=\"qm7jne\" data-start=\"1746\" data-end=\"1777\"\u003eFlow-through discharge design\u003c\/li\u003e\n\u003cli data-section-id=\"1d965fc\" data-start=\"1778\" data-end=\"1827\"\u003eDual gauge ports for monitoring system pressure\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1829\" data-end=\"1832\"\u003e\n\u003ch2 data-section-id=\"1cgu054\" data-start=\"1834\" data-end=\"1861\"\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cp data-start=\"1863\" data-end=\"1884\"\u003e\u003cstrong data-start=\"1863\" data-end=\"1879\"\u003ePart Number:\u003c\/strong\u003e 1594\u003c\/p\u003e\n\u003cp data-start=\"1886\" data-end=\"1916\"\u003e\u003cstrong data-start=\"1886\" data-end=\"1903\"\u003eManufacturer:\u003c\/strong\u003e General Pump\u003c\/p\u003e\n\u003cp data-start=\"1918\" data-end=\"1933\"\u003e\u003cstrong data-start=\"1918\" data-end=\"1928\"\u003eModel:\u003c\/strong\u003e K3.1\u003c\/p\u003e\n\u003cp data-start=\"1935\" data-end=\"1981\"\u003e\u003cstrong data-start=\"1935\" data-end=\"1952\"\u003eProduct Type:\u003c\/strong\u003e Flow Actuated Unloader Valve\u003c\/p\u003e\n\u003cp data-start=\"1983\" data-end=\"2012\"\u003e\u003cstrong data-start=\"1983\" data-end=\"1998\"\u003eFlow Range:\u003c\/strong\u003e 3.0 – 4.2 GPM\u003c\/p\u003e\n\u003cp data-start=\"2014\" data-end=\"2049\"\u003e\u003cstrong data-start=\"2014\" data-end=\"2033\"\u003ePressure Range:\u003c\/strong\u003e 400 – 1,450 PSI\u003c\/p\u003e\n\u003cp data-start=\"2051\" data-end=\"2082\"\u003e\u003cstrong data-start=\"2051\" data-end=\"2072\"\u003eMaximum Pressure:\u003c\/strong\u003e 1,450 PSI\u003c\/p\u003e\n\u003cp data-start=\"2084\" data-end=\"2114\"\u003e\u003cstrong data-start=\"2084\" data-end=\"2108\"\u003eMaximum Temperature:\u003c\/strong\u003e 195°F\u003c\/p\u003e\n\u003cp data-start=\"2116\" data-end=\"2148\"\u003e\u003cstrong data-start=\"2116\" data-end=\"2137\"\u003eInlet Connection:\u003c\/strong\u003e 3\/8\" BSP-F\u003c\/p\u003e\n\u003cp data-start=\"2150\" data-end=\"2183\"\u003e\u003cstrong data-start=\"2150\" data-end=\"2172\"\u003eOutlet Connection:\u003c\/strong\u003e 3\/8\" BSP-M\u003c\/p\u003e\n\u003cp data-start=\"2185\" data-end=\"2218\"\u003e\u003cstrong data-start=\"2185\" data-end=\"2207\"\u003eBypass Connection:\u003c\/strong\u003e 3\/4\" BSP-M\u003c\/p\u003e\n\u003cp data-start=\"2220\" data-end=\"2241\"\u003e\u003cstrong data-start=\"2220\" data-end=\"2236\"\u003eGauge Ports:\u003c\/strong\u003e Dual\u003c\/p\u003e\n\u003cp data-start=\"2243\" data-end=\"2304\"\u003e\u003cstrong data-start=\"2243\" data-end=\"2260\"\u003eConstruction:\u003c\/strong\u003e Brass \u0026amp; Stainless Steel Internal Components\u003c\/p\u003e\n\u003cp data-start=\"2306\" data-end=\"2340\"\u003e\u003cstrong data-start=\"2306\" data-end=\"2337\"\u003eMinimum Bypass Requirement:\u003c\/strong\u003e 5%\u003c\/p\u003e\n\u003cp data-start=\"2342\" data-end=\"2385\"\u003e\u003cstrong data-start=\"2342\" data-end=\"2357\"\u003eRepair Kit:\u003c\/strong\u003e Kit 59 (Barens Order #3146)\u003c\/p\u003e\n\u003cp data-start=\"2387\" data-end=\"2424\"\u003e\u003cstrong data-start=\"2387\" data-end=\"2402\"\u003eDimensions:\u003c\/strong\u003e 5.75\" x 3.50\" x 2.75\"\u003c\/p\u003e\n\u003cp data-start=\"2426\" data-end=\"2446\"\u003e\u003cstrong data-start=\"2426\" data-end=\"2437\"\u003eWeight:\u003c\/strong\u003e 1.7 lbs.\u003c\/p\u003e\n\u003cp data-start=\"2448\" data-end=\"2472\"\u003e\u003cstrong data-start=\"2448\" data-end=\"2468\"\u003eOEM Replacement:\u003c\/strong\u003e Yes\u003c\/p\u003e\n\u003chr data-start=\"2474\" data-end=\"2477\"\u003e\n\u003ch2 data-section-id=\"xfstd5\" data-start=\"2479\" data-end=\"2516\"\u003eHow the Flow Actuated Design Works\u003c\/h2\u003e\n\u003cp data-start=\"2518\" data-end=\"2622\"\u003eUnlike pressure-actuated unloaders that rely on a check valve, the K3.1 uses a precision orifice system.\u003c\/p\u003e\n\u003cp data-start=\"2624\" data-end=\"2655\"\u003eWhen the trigger gun is closed:\u003c\/p\u003e\n\u003cul data-start=\"2657\" data-end=\"2948\"\u003e\n\u003cli data-section-id=\"1hjz8gv\" data-start=\"2657\" data-end=\"2703\"\u003eWater flow stops or is significantly reduced\u003c\/li\u003e\n\u003cli data-section-id=\"hfmbb\" data-start=\"2704\" data-end=\"2750\"\u003ePressure rises immediately after the orifice\u003c\/li\u003e\n\u003cli data-section-id=\"q72xkn\" data-start=\"2751\" data-end=\"2811\"\u003eA pressure channel directs pressure to the piston assembly\u003c\/li\u003e\n\u003cli data-section-id=\"1t36d8k\" data-start=\"2812\" data-end=\"2840\"\u003eThe piston shifts position\u003c\/li\u003e\n\u003cli data-section-id=\"18q08x3\" data-start=\"2841\" data-end=\"2889\"\u003eWater is redirected through the bypass circuit\u003c\/li\u003e\n\u003cli data-section-id=\"ggpbv4\" data-start=\"2890\" data-end=\"2948\"\u003eSystem pressure is reduced throughout the discharge line\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"2950\" data-end=\"3027\"\u003eThis design minimizes pressure spikes and promotes smoother system operation.\u003c\/p\u003e\n\u003chr data-start=\"3029\" data-end=\"3032\"\u003e\n\u003ch2 data-section-id=\"6n13xl\" data-start=\"3034\" data-end=\"3063\"\u003eBalanced Nozzle Technology\u003c\/h2\u003e\n\u003cp data-start=\"3065\" data-end=\"3135\"\u003eThe K3.1's unique balanced nozzle principle offers several advantages:\u003c\/p\u003e\n\u003cul data-start=\"3137\" data-end=\"3360\"\u003e\n\u003cli data-section-id=\"1girmhb\" data-start=\"3137\" data-end=\"3187\"\u003eEliminates excessive pressure during bypass mode\u003c\/li\u003e\n\u003cli data-section-id=\"1mrm7h1\" data-start=\"3188\" data-end=\"3231\"\u003eReduces shock loads on pumps and plumbing\u003c\/li\u003e\n\u003cli data-section-id=\"1qd7au1\" data-start=\"3232\" data-end=\"3259\"\u003eImproves system longevity\u003c\/li\u003e\n\u003cli data-section-id=\"uhf30x\" data-start=\"3260\" data-end=\"3295\"\u003eCreates smoother trigger response\u003c\/li\u003e\n\u003cli data-section-id=\"qsqsgd\" data-start=\"3296\" data-end=\"3332\"\u003eMinimizes damaging pressure surges\u003c\/li\u003e\n\u003cli data-section-id=\"94x7di\" data-start=\"3333\" data-end=\"3360\"\u003eEnhances operator control\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"3362\" data-end=\"3365\"\u003e\n\u003ch2 data-section-id=\"vx2wyp\" data-start=\"3367\" data-end=\"3389\"\u003eCommon Applications\u003c\/h2\u003e\n\u003ch3 data-section-id=\"1ptmj6q\" data-start=\"3391\" data-end=\"3434\"\u003eLow to Medium Pressure Cleaning Systems\u003c\/h3\u003e\n\u003cp data-start=\"3436\" data-end=\"3446\"\u003eIdeal for:\u003c\/p\u003e\n\u003cul data-start=\"3448\" data-end=\"3569\"\u003e\n\u003cli data-section-id=\"d4mmu5\" data-start=\"3448\" data-end=\"3465\"\u003eVehicle washing\u003c\/li\u003e\n\u003cli data-section-id=\"18ydlce\" data-start=\"3466\" data-end=\"3497\"\u003eAgricultural spraying systems\u003c\/li\u003e\n\u003cli data-section-id=\"1nddkf1\" data-start=\"3498\" data-end=\"3517\"\u003eSoft wash systems\u003c\/li\u003e\n\u003cli data-section-id=\"9ezizr\" data-start=\"3518\" data-end=\"3538\"\u003eEquipment cleaning\u003c\/li\u003e\n\u003cli data-section-id=\"g04c8b\" data-start=\"3539\" data-end=\"3569\"\u003eSpecialty cleaning equipment\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-section-id=\"1wv7w4z\" data-start=\"3571\" data-end=\"3609\"\u003eCommercial Pressure Washer Systems\u003c\/h3\u003e\n\u003cp data-start=\"3611\" data-end=\"3624\"\u003eSuitable for:\u003c\/p\u003e\n\u003cul data-start=\"3626\" data-end=\"3779\"\u003e\n\u003cli data-section-id=\"tw9796\" data-start=\"3626\" data-end=\"3661\"\u003eProfessional cleaning contractors\u003c\/li\u003e\n\u003cli data-section-id=\"1rx70v9\" data-start=\"3662\" data-end=\"3698\"\u003eService and maintenance operations\u003c\/li\u003e\n\u003cli data-section-id=\"1mkyjzn\" data-start=\"3699\" data-end=\"3715\"\u003eFleet cleaning\u003c\/li\u003e\n\u003cli data-section-id=\"mnwjdg\" data-start=\"3716\" data-end=\"3747\"\u003eIndustrial wash-down stations\u003c\/li\u003e\n\u003cli data-section-id=\"meedk1\" data-start=\"3748\" data-end=\"3779\"\u003eCustom pressure washer builds\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"3781\" data-end=\"3784\"\u003e\n\u003ch2 data-section-id=\"ctfpuh\" data-start=\"3786\" data-end=\"3809\"\u003ePerformance Benefits\u003c\/h2\u003e\n\u003cul data-start=\"3811\" data-end=\"4032\"\u003e\n\u003cli data-section-id=\"vgtt6b\" data-start=\"3811\" data-end=\"3840\"\u003eSmooth pressure transitions\u003c\/li\u003e\n\u003cli data-section-id=\"1ero2xq\" data-start=\"3841\" data-end=\"3866\"\u003eReduced pressure spikes\u003c\/li\u003e\n\u003cli data-section-id=\"1bb2u3x\" data-start=\"3867\" data-end=\"3893\"\u003eImproved pump protection\u003c\/li\u003e\n\u003cli data-section-id=\"85ksmx\" data-start=\"3894\" data-end=\"3923\"\u003ePrecise pressure adjustment\u003c\/li\u003e\n\u003cli data-section-id=\"1gpagnp\" data-start=\"3924\" data-end=\"3957\"\u003eConsistent cleaning performance\u003c\/li\u003e\n\u003cli data-section-id=\"19klfdu\" data-start=\"3958\" data-end=\"3982\"\u003eReduced component wear\u003c\/li\u003e\n\u003cli data-section-id=\"1wdzf4p\" data-start=\"3983\" data-end=\"4002\"\u003eLong service life\u003c\/li\u003e\n\u003cli data-section-id=\"21zno3\" data-start=\"4003\" data-end=\"4032\"\u003eEnhanced system reliability\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"4034\" data-end=\"4037\"\u003e\n\u003ch2 data-section-id=\"1136s90\" data-start=\"4039\" data-end=\"4073\"\u003eSigns an Unloader Needs Service\u003c\/h2\u003e\n\u003cp data-start=\"4075\" data-end=\"4122\"\u003eInspect or rebuild the valve if you experience:\u003c\/p\u003e\n\u003cul data-start=\"4124\" data-end=\"4292\"\u003e\n\u003cli data-section-id=\"zta6im\" data-start=\"4124\" data-end=\"4147\"\u003ePressure fluctuations\u003c\/li\u003e\n\u003cli data-section-id=\"1vz4ts\" data-start=\"4148\" data-end=\"4179\"\u003eInconsistent bypass operation\u003c\/li\u003e\n\u003cli data-section-id=\"1ro85da\" data-start=\"4180\" data-end=\"4206\"\u003eReduced pressure control\u003c\/li\u003e\n\u003cli data-section-id=\"tfjehp\" data-start=\"4207\" data-end=\"4222\"\u003eWater leakage\u003c\/li\u003e\n\u003cli data-section-id=\"14ndoob\" data-start=\"4223\" data-end=\"4250\"\u003eTrigger response problems\u003c\/li\u003e\n\u003cli data-section-id=\"1t47d8i\" data-start=\"4251\" data-end=\"4292\"\u003eExcessive wear from long-term operation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"4294\" data-end=\"4297\"\u003e\n\u003ch2 data-section-id=\"16dprsq\" data-start=\"4299\" data-end=\"4320\"\u003eInstallation Notes\u003c\/h2\u003e\n\u003col data-start=\"4322\" data-end=\"4695\"\u003e\n\u003cli data-section-id=\"106r9wv\" data-start=\"4322\" data-end=\"4397\"\u003eInstall in the discharge line according to manufacturer recommendations.\u003c\/li\u003e\n\u003cli data-section-id=\"1g0tjvv\" data-start=\"4398\" data-end=\"4463\"\u003eEnsure at least 5% bypass flow is maintained during operation.\u003c\/li\u003e\n\u003cli data-section-id=\"1yu7mjc\" data-start=\"4464\" data-end=\"4531\"\u003eVerify compatibility with system flow and pressure requirements.\u003c\/li\u003e\n\u003cli data-section-id=\"cnkw55\" data-start=\"4532\" data-end=\"4608\"\u003eInstall a pressure gauge using one of the dual gauge ports when possible.\u003c\/li\u003e\n\u003cli data-section-id=\"1bmxe0e\" data-start=\"4609\" data-end=\"4650\"\u003eAdjust operating pressure as required.\u003c\/li\u003e\n\u003cli data-section-id=\"1wv61sy\" data-start=\"4651\" data-end=\"4695\"\u003eTest bypass operation after installation.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp data-start=\"4697\" data-end=\"4790\"\u003e\u003cstrong data-start=\"4697\" data-end=\"4711\"\u003eImportant:\u003c\/strong\u003e Proper bypass flow is required for correct operation and equipment protection.\u003c\/p\u003e\n\u003chr data-start=\"4792\" data-end=\"4795\"\u003e\n\u003ch2 data-section-id=\"8fimbm\" data-start=\"4797\" data-end=\"4827\"\u003eMaintenance Recommendations\u003c\/h2\u003e\n\u003cul data-start=\"4829\" data-end=\"5080\"\u003e\n\u003cli data-section-id=\"8e7fsu\" data-start=\"4829\" data-end=\"4868\"\u003eInspect regularly for leaks and wear.\u003c\/li\u003e\n\u003cli data-section-id=\"141w1dy\" data-start=\"4869\" data-end=\"4909\"\u003eVerify pressure settings periodically.\u003c\/li\u003e\n\u003cli data-section-id=\"14vksz\" data-start=\"4910\" data-end=\"4942\"\u003eMaintain adequate bypass flow.\u003c\/li\u003e\n\u003cli data-section-id=\"11v5qqr\" data-start=\"4943\" data-end=\"4981\"\u003eKeep water filtration systems clean.\u003c\/li\u003e\n\u003cli data-section-id=\"15t4en5\" data-start=\"4982\" data-end=\"5034\"\u003eRebuild using \u003cstrong data-start=\"4998\" data-end=\"5008\"\u003eKit 59\u003c\/strong\u003e when service is required.\u003c\/li\u003e\n\u003cli data-section-id=\"4zk0f7\" data-start=\"5035\" data-end=\"5080\"\u003eFollow General Pump maintenance guidelines.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"General Pump","offers":[{"title":"Default Title","offer_id":53429590819179,"sku":null,"price":140.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0917\/9201\/5723\/files\/GeneralSprayers_Logo_250x250_1_c9042f5b-e2a7-4132-b87e-88259bf80627.png?v=1782524709","url":"https:\/\/generalsprayers.com\/products\/k3-1-pressure-washer-unloader-valve-3-0-4-2-gpm-400-1450-psi-oem-replacement-part","provider":"GeneralSprayers","version":"1.0","type":"link"}